Spark-plug.



'A. R. MOSLER! SPARK PLUG.

APPLICATION FILED AUG.12,1914.

Patent-ed June 6, 1916.

WZZncaweaP ARTHUR R. MOSLER, OF NEW YQR SPARK-PLUG.

- To cilia/ mm, it may concern.

The object of my invention is to provide a spark plug which will be very simple in construction, cheap to manufacture and gas tight.

A further object is to provide certain improvements in the construction, form'and arrangement of the several parts whereby r the insulator is permanently locked in po- ,sition within its shell by a single locking ring introduced through the inner end of the shell and permanently forced out of its original shape, said ring; being; composed of a metal such as aluminum having a greater coellicient of expansion than the metal of which the shell is made.

A practical embodiment of my intention. is represented in the accompanying drawing, in which- Figure 1 represents the shell, the insulator, the outside packing ring and the in side locking lin in longitudinal central section, the inside locking ring being in the position which it assumes before it is forced into position for locking the parts together, l 2 is a. longitudinal central section through the spark plug" showing the positions wuich the parts assume after the look ing ring has becniorced into position for locking" the insulator to the shell, and Fig. 3 is a. similar view showing a slightly modified form in which the use of a recess in, the shell for receiving a portion of the locking ring, is obviated.

The hollow shell is denoted by 1 and. it is provided with an annular scat 2-formcd by an inwardly directed annular flange 3 at its outer end. The bore '4- of the sl'icll is eylindrical and the shell may he provided with the usual externally screw threaded portiOn- 5. c

The insulator is denoted, by l) and is provided with a liang'e 7 intermediate its inner and outer ends, which flange forms an inner shoulder 8 and an outer shoulder 9, which shoulder 9 is opposite the seat 2 of the shell. 1. A packing ring 10 is interposed between the shoulder 9 and seat 2.

The shell 1 is provided with a recess 11 in its bore 4, which recess is herein shown Specification of Letters Patent.

l Patented June 6, 1916.

Application filed August 12, 1914. Serial No. 856,426.

as an annular groove adjacent to the shoulder 8 of the flange 7 The locking ring 12 is composed of some material, such as aluminum, which has a greater coellieient of expansion than the metal, such as steel, of which the shell 1 is composed. This locking ring 12 has a tapered bore 13 and a. cylindrical exterior surface, said cylindrical exterior surface having a sliding lit within the cylindrical bore 4 of the shell. This tapered bore of the locking ring 12 gives the walls of the ring 12 a wedge shape, thus permitting the ready insertion of a. portion of the ring between the flange '7 of the insulator and inner wall of the shell 1.

In assembling the parts, the insulator is inserted through the inner end of the shell. with the washer 1O interposed between the shoulder 9 and seat 2. The locking ring 12 is then inserted through the inner end of the shell, into the. position shown in Fig. 1. The insulator and shell is then placed in the die of a press and a suitable tool, such as a ring-shaped punch is introduced througl'i the inner end of the shell into engagement with the locking: ring, l2 forcing the same out of its original shape and cansin t 1e ring to wedge itself between the flange '7 of the insulator and the'inuer walls of the shell, and. at the same time, filling the recess 11. At the same time the packing ring 10 at the outer end of the shell is compressed thus locking the insulator permanently to the shell with the exterior of the insulator spaced from the shell.

In Fig. 3 I have shown no recess 11. In this form. the wcdging action of the locking ring between the insulator and the inner walls of the shell is depended upon for the permanent locking of the insulator to the shell.

Alter the insulator has been locked to the shell, the electrode 1-l; may be inserted llll'OllQll the insulator and held in its position with the usual nuts 15 and 16. It is also provided with the binding nut 17.

It is evident that slight changes may be resorted to in the form, construction and arrangcn'ient of the several parts without departing from the spirit and scope of my invention hence I do not wish to limit myself strictly to the structure herein shown and described, but I \Vhat I claim is .1' A spark plug comprising an insulator having a. circumferential flange, a shell and means introduced through the inner end of the shell and torcedhetween the flange and shell for permanently spacing the insulator from and securing it within the shell.

2. A spark plug comprising an insulator having a circumferential flange, a shell and a wedgeshaped ring introduced through the inner end of the shell and forced between the flange and shell for perumnently sparing the insulator from and seeming it 'ithin the shell.

A spark plug comprising an insulator having a clrcrunterential flange, a shell and Ya wedgeshaped ring of metal having a greater coeilicient of expansion than the metal of the shell. introduced through the inner end of the shell and forced between the flange and shell for permanently spacing the insulator from and securing it within the shell.

l. A spark plug comprising an insulator, a shell having a recess in its bore and means introduced through the inner end of the shell and forced between the insulator and shell and into said recess for permanently securing the insulator within the shell.

A spark plug comprising an insulator a shell having a recess in its bore and a wedge-shaped ring introdiu'ed through the inner end of the shell and forced between the insulator and shell and into said recess for permanently securing the insulator within the shell.

6. A- spark plug comprising an insulator, a shell having a recess in its bore and a wedge-shaped ring of metal having a greater coeificient of expansion than the metal of the shell, introduced through the inner end of the shell and forced between the insulator and shell. and into said recess for perma-.

nently securing the insulator within the shell.

7 A spark plug comprising an insulator having a shoulder, a shell having a seat and a recess in its bore, a packing interposed hetween the shoulder and seat, and a Wedgeshaped ring introduced through the inner end oft the shell and forced between the insulator and shell and into said recess for permanently securing the insulator within the shell.

8. A spark plug comprising an insulator having a shoulder, a shell having a seat and a recess in its bore, a packing interposed between the shoulder and seat, and a wedgeshaped ring of metal having a greater coeliicient of expansion than the metal of the shell, introduced through the inner end of the shell and forced between the insulator and shell and into said recess for permanently securing the insulator Within the shell.

In testimony, that I claim the foregoing as my invention. I have signed my name in presence of two witnesses, this tenth day of August 191%.

ARTHUR It. M(V)SLER.

\Vitnesses l1. Gannon Bannr, C. S. SUNDGlueN. 

